Styjun

This a specific question about sebcrozet/kiss3d (a graphics package for games written in rust): how do I clear the 'scene'?

I can add objects to the scene by window.add_mesh() and similar methods, and it seems I can remove specific objects by windows.remove_node(), but how do I remove all the objects in a scene (e.g. to start a new scene)?

I suppose I could keep a vector of all the objects in the scene, and then iterate over the vector to remove the objects, but that should not be necessary.

Edit: here is some code that reproduces the error, excerpted from my code.

use kiss3d::resource::Mesh;
use kiss3d::window::Window;
use na::Point3;
use na::Vector3;
use rand::Rng;
use std::cell::RefCell;
use std::rc::Rc;
extern crate kiss3d;
extern crate nalgebra as na;
extern crate rand;
fn main() 
 let mut window = Window::new("Test");
 const FRAMES_PER: u16 = 100;
 let mut frame_count = FRAMES_PER;
 let mut rng = rand::thread_rng();
 window.set_point_size(5.0);
 while window.render() 
 frame_count += 1;
 if frame_count > FRAMES_PER 
 window
 .scene_mut()
 .apply_to_scene_nodes_mut(&mut 
 

You can get a scene from a window with the Window::scene_mut function, which will return a SceneNode.

After you get your mutable scene node you can delete all the objects inside of the scene with the SceneNode::apply_to_scene_nodes function.

As documented in kiss3d docs page:

fn apply_to_scene_nodes_mut<F: FnMut(&mut SceneNode)>(&mut self, f: &mut F)

Applies a closure to each object contained by this node and its children.

This is the method that takes closure in it and applies it to the all nodes inside to scene. So you don't need to add all the objects to a Vec.

Note that this method is working recursively to apply the function you provided to all the childrens of the parent and itself.

In your case it is only needed to unlink the parent scene like following:

window.scene_mut().unlink();

Whenever you unlink the parent scene node, then the children will be unlinked with the parent of course. So in your needs you may not need to
SceneNode::apply_to_scene_nodes even.

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